[PHP]Chinese character turn into garbled on (Website)Chrome , normal in VScode

Question

I have an issue in my php code.

I tried to type Chinese character in VScode and echo to Chrome website.

But my Chinese character turn into garbled on Chrome.

Already defined header - charset=utf8 even charset=utf8mb4, but it still in vain.

Is there any ways could debug this issue?

BTW, I use MAMP.

<?php

// header("Content-Type:text/html; charset=utf8mb4");
header('Content-Type:text/html; charset=utf8');

echo '這是中文 utf-8';

?>